This machined Lightbar is super sturdy allowing you to mount nearly any auxilliary driving light that has a threaded stud no larger than 0.375" in diameter. All parts are manufactured from aircraft quality 6061 aluminum alloy and are black anodized. Fasteners are zinc-plated steel to resist corrosion. There are no holes to drill. Each Lightbar includes all necessary hardware, brackets and installation directions. An excellent lightbar for the new light weight LED lights.